HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Pobierz pdf (Strona 238)

100

101

point(abscissa(A), ordinate(B)) creates a point whose x-coordinate is the same as that of a

point A and whose y-coordinate is the same as that of a point B. This point will change to reect the

movements of point A or point B.

Point on

Creates a point on a geometric object whose abscissa is a given value or creates a real value on a given

interval.

element(object, real) or element(real1..real2)

Examples:

element(plotfunc(x^2),–2) creates a point on the graph of y = x

. Initially, this point will appear at (–

2,4). You can move the point, but it will always remain on the graph of its function.

element(0..5) creates a slider bar with a value of 2.5 initially. Tap and hold this value to open the slider.

Select or to increase or decrease the value on the slider bar. Press to close the slider

bar. The value that you set can be used as a

coeicient in a function that you subsequently plot or in some

other object or calculation.

Midpoint

Returns the midpoint of a segment. The argument can be either the name of a segment or two points that

dene a segment. In the latter case, the segment need not actually be drawn.

midpoint(segment) or midpoint(point1, point2)

Example:

midpoint(0,6+6i) returns point(3,3)

Center

Syntax: center(Circle)

Plots the center of a circle. The circle can be dened by the circle command or by name (for example, GC).

Example:

center(circle(x^2+y2–x–y)) plots point(1/2,1/2)

Intersection

Syntax: single_inter(Curve1, Curve2, [Point])

Plots the intersection of Curve1 and Curve2 that is closest to Point.

Example:

single_inter(line(y=x), circle(x^2+y^2=1), point(1,1)) plots

point((1+i)*√2/2)

Intersections

Returns the intersection of two curves as a vector.

inter(Curve1, Curve2)

Example:

190 Chapter 9 Geometry

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